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# Pre-Cal 40S Slides October 26, 2007

## by Darren Kuropatwa, Educator at ∞ß on Oct 26, 2007

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Finish proving the angle sum and difference identities ... exercises.

Finish proving the angle sum and difference identities ... exercises.

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## Pre-Cal 40S Slides October 26, 2007Presentation Transcript

• PROOF continued ... Proofing
• Proofs of the Sum and Difference Identities ... O Rotate ∠ROP so that OP O lies on the positive x-axis
• Proofs of the Sum and Difference Identities ... O Rotate ∠ROP so that OP O lies on the positive x-axis
• Recall the Even and Odd Identities The sine and tangent functions are ODD functions. Cosine is an EVEN function. sin(-x) = -sin(x) cos(-x) = cos(x) tan(-x) = -tan(x)
• Recall the Even and Odd Identities The sine and tangent functions are ODD functions. Cosine is an EVEN function. sin(-x) = -sin(x) cos(-x) = cos(x) tan(-x) = -tan(x)
• Now back to our regularly scheduled programming ...
• How would you show this ...
• Recall the Even and Odd Identities The sine and tangent functions are ODD functions. Cosine is an EVEN function. sin(-x) = -sin(x) cos(-x) = cos(x) tan(-x) = -tan(x) How would you show this ...
• Given: With and Find
• Given: With and Find
• Prove the following identity ...
• Prove: